[rubygems/rubygems] Fix `bundle outdated <GEM>` failing if gems not i… #623

Job	Run time
make (check, cppflags=-DVM_CHECK_MODE)	8m 33s
make (check, i686)	10m 12s
make (check, --disable-yjit)	6m 40s
make (check, --enable-shared --enable-load-relative)	7m 16s
make (test-bundler-parallel, 50)	27m 13s
make (test-bundled-gems)	16m 12s
make (check, ubuntu-20.04)	9m 44s
make (check, ubuntu-24.04)	8m 21s
Ubuntu result	1s
	1h 34m 12s

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